from PyQt5 import QtCore, QtGui, QtWidgets
from PyQt5.QtCore import Qt, QEvent
from PyQt5.QtGui import QColor, QPalette, QStandardItem
from PyQt5.QtWidgets import QGraphicsDropShadowEffect, QGridLayout, QComboBox, QStyledItemDelegate, qApp
[docs]class QCheckableComboBox(QComboBox):
# Subclass Delegate to increase item height
[docs] class Delegate(QStyledItemDelegate):
[docs] def sizeHint(self, option, index):
size = super().sizeHint(option, index)
size.setHeight(20)
return size
def __init__(self, parent=None):
if parent is None:
super().__init__()
else:
super().__init__(parent=parent)
# Make the combo editable to set a custom text, but readonly
self.setEditable(True)
self.lineEdit().setReadOnly(True)
# Make the lineedit the same color as QPushButton
palette = qApp.palette()
palette.setBrush(QPalette.Base, palette.button())
self.lineEdit().setPalette(palette)
# Use custom delegate
self.setItemDelegate(QCheckableComboBox.Delegate())
# Update the text when an item is toggled
self.model().dataChanged.connect(self.updateText)
# Hide and show popup when clicking the line edit
self.lineEdit().installEventFilter(self)
self.closeOnLineEditClick = False
# Prevent popup from closing when clicking on an item
self.view().viewport().installEventFilter(self)
[docs] def resizeEvent(self, event):
# Recompute text to elide as needed
self.updateText()
super().resizeEvent(event)
[docs] def eventFilter(self, obj, event):
if obj == self.lineEdit():
if event.type() == QEvent.MouseButtonRelease:
if self.closeOnLineEditClick:
self.hidePopup()
else:
self.showPopup()
return True
return False
if obj == self.view().viewport():
if event.type() == QEvent.MouseButtonRelease:
index = self.view().indexAt(event.pos())
item = self.model().item(index.row())
if item.checkState() == Qt.Checked:
item.setCheckState(Qt.Unchecked)
if item == self.model().item(0):
# deselect all items if item check is all
for i in range(1, self.model().rowCount()):
item = self.model().item(i)
item.setCheckState(Qt.Unchecked)
else:
item.setCheckState(Qt.Checked)
if item == self.model().item(0):
# deselect all items if item check is all
for i in range(1, self.model().rowCount()):
item = self.model().item(i)
item.setCheckState(Qt.Checked)
return True
return False
[docs] def timerEvent(self, event):
# After timeout, kill timer, and reenable click on line edit
self.killTimer(event.timerId())
self.closeOnLineEditClick = False
[docs] def updateText(self):
texts = []
for i in range(1, self.model().rowCount()):
if self.model().item(i).checkState() == Qt.Checked:
texts.append(self.model().item(i).text())
text = ", ".join(texts)
self.lineEdit().setText(text)
# # Compute elided text (with "...")
# metrics = QFontMetrics(self.lineEdit().font())
# elidedText = metrics.elidedText(text, Qt.ElideRight, self.lineEdit().width())
# self.lineEdit().setText(elidedText)
[docs] def addItem(self, text, data=None):
item = QStandardItem()
item.setText(text)
if data is None:
item.setData(text)
else:
item.setData(data)
item.setFlags(Qt.ItemIsEnabled | Qt.ItemIsUserCheckable)
item.setData(Qt.Unchecked, Qt.CheckStateRole)
self.model().appendRow(item)
[docs] def addItems(self, texts, datalist=None):
for i, text in enumerate(texts):
try:
data = datalist[i]
except (TypeError, IndexError):
data = None
self.addItem(text, data)
[docs] def currentData(self, role=None):
# Return the list of selected items data
res = []
for i in range(self.model().rowCount()):
if self.model().item(i).checkState() == Qt.Checked:
res.append(self.model().item(i).data())
return res